US5921486A - Papermaking refiner plates - Google Patents
Papermaking refiner plates Download PDFInfo
- Publication number
- US5921486A US5921486A US09/016,984 US1698498A US5921486A US 5921486 A US5921486 A US 5921486A US 1698498 A US1698498 A US 1698498A US 5921486 A US5921486 A US 5921486A
- Authority
- US
- United States
- Prior art keywords
- segment
- refiner
- bars
- supporting plate
- blades
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
- D21D1/306—Discs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C7/00—Crushing or disintegrating by disc mills
- B02C7/11—Details
- B02C7/12—Shape or construction of discs
Definitions
- the present invention relates to papermaking and refining of lignocellulosic and other natural and synthetic fibrous materials in the manufacture of paper, paperboard, and fiberboard products.
- the invention relates to replacable refiner fillings used in the process of refining chip or pulp.
- the refining working surfaces of the refiner fillings are comprised of closely spaced bars and grooves which work against each other through relative rotation while the fibrous material passes between them.
- the clearance between the opposed bar and groove working surfaces determines the power applied to the refiner, as well as the extent of refining of the fibrous material.
- the bars of any refiner type can be of any practical width and spacing, the actual width and spacing are limited by the materials and methods used to make them, or by the cost to make them, or both.
- the replacable working surfaces, or refiner plates as they are most commonly called may be made by casting or machining. In some instances they may be made by fabricating wherein appropriately spaced bars are affixed by welding onto a base.
- the width of the bar and the width of the groove are limited to no less than about 1/8".
- cast bars narrower than this are prone to breakage due to internal flaws, and the need to have a draft angle of 3 deg. or so for the casting process, causes the groove volume (which provides for passage of fibrous material) to be greatly diminished at closer bar spacing than about 1/8".
- the limiting factor is cost.
- the cost is more or less proportional to the number of grooves which must be milled to the required depth in a solid steel blank.
- Toughness is a required property because occasional tramp metal contamination occurs in the process medium. If the plates were to shatter when a piece of metal passed through the refiner, it would cause severe and costly operational problems for the paper or board mill.
- a full circle replacement plate for a 34" or larger refiner will weigh several hundred pounds thus requiring lifting aids for installation into, and removal from, a refiner.
- Cast refiner plates can be, and usually are produced in segments, with each segment being 30, 45, or 60 degrees and with 12, 8, or 6 segments respectively being required to make up a complete replacement working surface for a single disc of a disc refiner. Each segment will weigh less than 35 pounds, and will usually be individually bolted into the place on the disc, such that an entire set of plates can be replaced by a person without the need for special lifting devices.
- most replacement disc refiner plates are castings, usually of special cast iron or stainless steel alloys.
- Refiner disc plate segments have precisely radial side edges such that it is a somewhat costly complication to produce a disc working surface pattern having no precisely radial bar or groove at the segmental dividing lines. Therefore, the segment joint must cut across the pattern of bars and grooves at a shallow angle. This requirement is difficult and costly to accomplish in the case of machined and fabricated plates and which, even in the case of cast plates, leaves narrowly tapered bars likely to be very much weakened at their extremities.
- the present invention provides improvements in replaceable refiner fillings and has as a primary objective the manufacture of refiner fillings with working surfaces using relatively narrow, closely spaced bars on the working surface of the plate. This is accomplished by using relatively thin blades of any suitable material, separated by shallower spacer bars having a thickness which determines the width of the grooves, and subsequently fusing or bonding the assembled blades and spacers into a solid piece by methods appropriate for the blade and spacer materials being used.
- blade and spacer components are selected from metallic materials having different corrosion resistance.
- Cathodic protection for the refiner blade elements is achieved by using a metallic material for the spacer which is less noble, according to the Electromotive-Force Series of Metals, than the material used for the blade. In this way, the spacer, which is not subject to appreciable abrasion, will pit and corrode harmlessly, while the blade or bar wear is greatly reduced.
- This feature of galvanic, or cathodic, protection is also applied to cast or machined refiner plates by inserting or attaching sacrificial metal elements.
- improved segmental replacement disc refiner plates are produced with segments having both non-circular edges (i.e., side edges) which are not precisely radial. Instead, the side edges are oblique to the precisely radial line by an angle between about 3 and 20 degrees such that the refiner plate segmental dividing line is parallel to the adjacent refiner blade.
- FIG. 1 is a plan view of the working surface of a refiner disc plate showing an arrangement of bars according to the invention.
- FIG. 2 is a section view taken along FIG. 2--2 of FIG. 1.
- a preferred embodiment of a refiner disc 10 comprises a supporting plate 12 to which blades 14 and spacers 16 are affixed and wherein the blades and spacers define the disc working surface and intervening grooves 18.
- the blades may be fabricated of any suitable durable material including metals such as aluminum, bronze, nickel alloy, and ceramic or composite materials capable of bonding to spacers.
- the spacers are any suitable material that can be strongly bonded to the supporting plate. Materials for blades are selected for hardness and corrosion resistance.
- the blades are fabricated of stainless steel, and the spacers of plain carbon steel, and the backing plate of either plain carbon steel or stainless steel.
- the entire assembly of blades, spacers and backing plate are bonded to comprise a refiner disc by a process of copper brazing or high temperature diffusion welding.
- the topmost surface of the stainless steel blade is constantly exposed to abrasive removal of a protective oxide layer.
- the exposed surface is much more resistant to abrasive/corrosive wear because of the cathodic protection provided by the immediately adjacent and less noble carbon steel spacer.
- the refiner disc 10 is defined by outer 20 and inner 22 concentric segments and side edges 24, 26 offset or oblique to the radius R of the outer circle.
- Each segment may have a value for ⁇ of 30, 45, or 60 degrees so that 12, 8, or 6 segments, respectively comprise a refiner disc.
- the segement bars 14 are positioned parallel to the right side edge and extend from the outer periphery 20 inwardly toward the inner periphery 22 of the segment. As shown in FIG. 1, the bars terminate short of the inner periphery thereby defining with the inner periphery a feeding zone 28 for pulp entry to the refiner blades and grooves. Feeder bars 30 aid in directing pulp flow into the refeiner grooves. Bores 32 accommodate fasteners (not shown) for securing the segments in place.
- blade obliqueness to the segment radial R increases with distance normal to right side edge 24.
- the blade 14' nearest the right side edge has an oblique angle equal to ⁇
- bar 14" has a greater oblique angle, ⁇ .
- the blade pattern is begun anew at that location in the refiner segment where increasing obliqueness (as the case with blade 14") approaches 20 degrees. So, at this location the bar pattern is reset beginning with a low angle ⁇ , say 3 degrees, and continuing until the bar pattern reaches the left side edge of the segment 26.
- Blade pattern repetition may be unnecessary in the case of narrower disc segments as in a refiner disc with 12 segments of 30 degrees each.
- the disc refiner segment with non-radial side edges permits the blade of spacer immediately adjacent to one edge to be parallel to the edge while not being precisely radial in its orientation. Therefore, the bars on opposing rotor and stator plates never cross radially and thereby avoid refiner process disadvantages induced by radial crossing of bars.
- the refiner plates according to the invention have the advantages of reduced cost and increased durability with having short blades bordering on one edge only of the disc segment.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Paper (AREA)
Abstract
Description
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/016,984 US5921486A (en) | 1996-04-15 | 1998-02-02 | Papermaking refiner plates |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/632,215 US5740972A (en) | 1996-04-15 | 1996-04-15 | Papermaking refiner plates |
US09/016,984 US5921486A (en) | 1996-04-15 | 1998-02-02 | Papermaking refiner plates |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/632,215 Division US5740972A (en) | 1996-04-15 | 1996-04-15 | Papermaking refiner plates |
Publications (1)
Publication Number | Publication Date |
---|---|
US5921486A true US5921486A (en) | 1999-07-13 |
Family
ID=24534573
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/632,215 Expired - Lifetime US5740972A (en) | 1996-04-15 | 1996-04-15 | Papermaking refiner plates |
US09/016,984 Expired - Lifetime US5921486A (en) | 1996-04-15 | 1998-02-02 | Papermaking refiner plates |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/632,215 Expired - Lifetime US5740972A (en) | 1996-04-15 | 1996-04-15 | Papermaking refiner plates |
Country Status (1)
Country | Link |
---|---|
US (2) | US5740972A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040128817A1 (en) * | 2002-12-13 | 2004-07-08 | Werner Lange | Method for the manufacture of fillings for utilization in the mechanical processing of aqueous paper fiber stock |
US6935589B1 (en) * | 1998-08-17 | 2005-08-30 | Norwalk Industrial Components, Llc | Papermaking refiner plates and method of manufacture |
WO2015197192A1 (en) | 2014-06-27 | 2015-12-30 | Andritz Fiedler Gmbh | Set for mechanical processing, in particular refining of suspended fibrous material |
US9988762B2 (en) * | 2014-05-07 | 2018-06-05 | University Of Maine System Board Of Trustees | High efficiency production of nanofibrillated cellulose |
RU194532U1 (en) * | 2019-09-16 | 2019-12-13 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Уральский государственный лесотехнический университет" | DISC MILL HEADSET |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5954283A (en) * | 1996-04-15 | 1999-09-21 | Norwalk Industrial Components, Llc | Papermaking refiner plates |
US6245289B1 (en) | 1996-04-24 | 2001-06-12 | J & L Fiber Services, Inc. | Stainless steel alloy for pulp refiner plate |
EP1148971B1 (en) * | 1998-08-17 | 2006-08-02 | John B. Matthew | Papermaking refiner plates and method of manufacture |
GB2372542B (en) * | 2001-02-23 | 2003-08-20 | Bespak Plc | Dosage counting devices |
GB2372543B (en) * | 2001-02-23 | 2003-08-20 | Bespak Plc | Dosage counting devices |
GB2385640B (en) * | 2001-02-23 | 2003-10-15 | Bespak Plc | Dosage counting devices |
CA2585070A1 (en) * | 2004-10-21 | 2006-04-27 | Welldone Weartec N.V. | Crushing element and mills with grinding bodies, mixers, extruders and a pressing worm provided with said crushing elements |
US20190330798A1 (en) * | 2016-12-14 | 2019-10-31 | Byung Kul MIN | Refiner bar plate including micro-fine bar and method for manufacturing same |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191201895A (en) * | 1912-01-24 | 1912-12-12 | William Stephenson Barron | Improvements in Mill Stones. |
US3459379A (en) * | 1967-01-18 | 1969-08-05 | Beloit Corp | Mechanical pulping apparatus |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US267763A (en) * | 1882-11-21 | Pierre tanvez | ||
US773363A (en) * | 1904-01-22 | 1904-10-25 | Carl P Anderson | Millstone. |
GB430729A (en) * | 1933-09-18 | 1935-06-24 | Buhler Brothers | Improvements in or relating to grinding discs for mills |
US3614826A (en) * | 1967-11-23 | 1971-10-26 | Milton Pilao | Method for the manufacture and recovery of conical and discs sets for woodpulp machines |
US3545513A (en) * | 1968-09-12 | 1970-12-08 | Leslie Palyi | Grinding element |
-
1996
- 1996-04-15 US US08/632,215 patent/US5740972A/en not_active Expired - Lifetime
-
1998
- 1998-02-02 US US09/016,984 patent/US5921486A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191201895A (en) * | 1912-01-24 | 1912-12-12 | William Stephenson Barron | Improvements in Mill Stones. |
US3459379A (en) * | 1967-01-18 | 1969-08-05 | Beloit Corp | Mechanical pulping apparatus |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6935589B1 (en) * | 1998-08-17 | 2005-08-30 | Norwalk Industrial Components, Llc | Papermaking refiner plates and method of manufacture |
US7779525B2 (en) * | 1998-08-17 | 2010-08-24 | Advanced Fiber Technologies (Aft) Trust | Papermaking refiner plates and method of manufacture |
US20090173813A1 (en) * | 1998-08-17 | 2009-07-09 | Matthew John B | Papermaking refiner plates and method of manufacture |
US7614129B2 (en) * | 2000-07-18 | 2009-11-10 | Norwalk Industrial Components, Llc | Papermaking refiner plates and method of manufacture |
US20060289689A1 (en) * | 2000-07-18 | 2006-12-28 | Matthew John B | Papermaking refiner plates & method of manufacture |
US7263755B2 (en) * | 2002-12-13 | 2007-09-04 | Voith Patent Gmbh | Method for the manufacture of fillings for utilization in the mechanical processing of aqueous paper fiber stock |
US20040128817A1 (en) * | 2002-12-13 | 2004-07-08 | Werner Lange | Method for the manufacture of fillings for utilization in the mechanical processing of aqueous paper fiber stock |
US9988762B2 (en) * | 2014-05-07 | 2018-06-05 | University Of Maine System Board Of Trustees | High efficiency production of nanofibrillated cellulose |
WO2015197192A1 (en) | 2014-06-27 | 2015-12-30 | Andritz Fiedler Gmbh | Set for mechanical processing, in particular refining of suspended fibrous material |
DE102014009588A1 (en) | 2014-06-27 | 2016-01-14 | Andritz Fiedler Gmbh | Set for mechanical working, in particular grinding of suspended pulp material |
CN106536821A (en) * | 2014-06-27 | 2017-03-22 | 安德里兹·菲德勒有限责任公司 | Set for mechanical processing, in particular refining of suspended fibrous material |
US9976253B2 (en) | 2014-06-27 | 2018-05-22 | Andritz Fiedler Gmbh | Set for the mechanical processing, in particular grinding of suspended fibrous material |
RU2667834C2 (en) * | 2014-06-27 | 2018-09-24 | Андриц Фидлер Гмбх | Set for mechanical processing, in particular milling suspended fibrous material |
US11453977B2 (en) | 2014-06-27 | 2022-09-27 | Andritz Fiedler Gmbh | Set for the mechanical processing, in particular grinding of suspended fibrous material |
RU194532U1 (en) * | 2019-09-16 | 2019-12-13 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Уральский государственный лесотехнический университет" | DISC MILL HEADSET |
Also Published As
Publication number | Publication date |
---|---|
US5740972A (en) | 1998-04-21 |
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